Vol. XXII, pp. 185-188 December 8, 1909 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



dp:scriptions of three new species of 



CYPRINOID fishes. 



BY BARTON WARREN EVERMANN AND 

 THEODORE D. A. COCKERELL. 



Ill tlie course of some work on the scales of the Cyprinido?, 

 a few species were found which seem to he new. Three of 

 these are here described; others need to be further elucidated, 

 both as to the constancy of their characters noted, and as to 

 their possible reference to names now placed in synonymy. 



The types of the species here described have been deposited 

 in the United States National Museum. 



Richardsonius thermophilus pp. nov. 



Type, No. 64152, U. S. Nat. Mas., a specimen (18 mm. long. 



Type Locality. — Warm Springs, Harney Co., Oregon. Collector, Prof. 

 John 0. Snyder, for tlie U. S. Bureau of Fisheries. 



Head 4 in length; depth 4; eye 3.3 in head; snout 4; maxillary 2.75; 

 dorsal 10; anal 11; scales 12-5(3-7. 



Form essentially as in R. balteatus; snout veryohtuse; scales with very 

 strong circuli. 



Color (in alcohol). — Scarcely silvery; back and upper half of side finely 

 punctulate and dark grayish, under parts straw color; peritoneum not 

 silvery, but with large and close diffuse brownish sjiots.* 



This fish has been discussed by Prof. J. 0. Snyder in Bull. Bureau of 

 Fisheries, XXVH (1907), p. 85. The following description of its colors 

 is given by him : 



" Dorsal surface of bocly deep green; a narrow, diffuse, brassy stripe 

 extending from eye along lateral line, falling below it posteriorly, form- 

 ing a ventral border to the greenish dorsal area; an indistinct dark 

 greenish stripe extends from eye along the side just below the brassy 

 band; breast and abdomen silvery; sides just below greenish band bright 



*This is probably not a direct effect of the local environments; for Rutilus columbi- 

 aiuts, from the same Warm Springs, has the peritoneum thickly beset with stellate 

 brown spots, and sprinkled with black dots. 



30— Proc. Biol. Soc. Wash.. Vol. XXII, 1909. (185) 



